If your modpack is not at such a high power level, we recommend Cataclysm Apotheosis Addon Lite.
Required Mod.
Attributizer.
Pehkui
L_ender's cataclysm
L_ender's cataclysm is definitely a mod that adds a high difficulty boss but is far easier to beat in a modpack that adds multiple weapons. (unless the creator changes the configuration). Also in my opinion the boss is more vulnerable than it looks. A player with high attack power can defeat it in a few dozen seconds. Make the following changes to make this mod boss the end content boss of modpack.
Ender Guardian (spoiler alert) https://www.youtube.com/watch?v=qylDRq6svhg
Harbinger (spoiler alert) https://www.youtube.com/watch?v=ZjHtFLvXwvI
Ancient Remnant (spoiler alert) https://www.youtube.com/watch?v=O4gAhpBtjgA
Leviathan (spoiler alert) https://www.youtube.com/watch?v=Xh3gnByrMYM&t=203s
Ignis (spoiler alert) https://www.youtube.com/watch?v=YonTACiuBnE
Maledictus (spoiler alert) https://www.youtube.com/watch?v=9pvRfo3p6AA
CurseForge link https://www.curseforge.com/minecraft/mc-mods/cataclysm-apotheosis-addon
